Boiler.



No. 762,237. PATENTED JUNE '7, 1904.

W. JACK. BOILER.

APPLICATION FILED JAN 15. 1904.

N0 MODEL.

2 SHEETS-SHEET 1.

m: Nosims vzrz'ns no, PHOTO-LIYNQ, WASHINGTON, 0. c5

No. 762,237. PATENTED JUNEV, 1904.

JACK.

BOILER.

APPLICATION FILED JAN. 15. 1904.

ffiimcovaov V U zzzjvim THE Nonms PETERS co. Pno'ro-umov. wnumorou. o. c.

IINTTED STATES Patented June 7, 1904.

PAT NT OFrrcE.

WILLIAM JACK, OF LONDON, ENGLAND, ASSIGNOR OF ONE-HALF TO DAVID IVHITEOAR, OF PHILADELPHIA, PENNSYLVANIA.

\ BOILER.

SPECIFICATION forming part of Letters Patent No. 762,237, dated June '7, 1904.

Application filed January 15, 1904. Serial No. 189,201. (No model.)

To all whom it may concern:

Be it known that I, WILLIAM JACK, a subject of the King of Great Britain, residing at 71 St. Martins avenue, Eastham, London, England, (whose post-office address is 10 Pine street, Philadelphia, Pennsylvania,) have invented certain Improvements in Boilers, of which the following is a specification.

My invention relates to certain improvements in boilers of the marine type, having as one of its objects the provision of a construction such that it shall be a comparatively simple matter to remove accumulations of scale from the rear inner surfaces of the combustionchamber.

A further object of the invention is to provide a combustion-chamber of such a form that it will not only have maximum strength to withstand the steam-pressure within the boiler, but shall also direct the heated products of combustion into the tubes of the boiler in such a manner as to avoid as far as possible their direct impact upon the metallic surface of the chamber and to assist their flow to said tubes to the greatest possible extent.

Another object of my improved construction is to facilitate the circulation of water in the boiler.

These objects I attain as hereinafter set forth, reference being had to the accompanying drawings, in which Figure 1 is a longitudinal sectional elevavation of my improved boiler, illustrating the detail construction of the combustion-chamber; and Fig. 2 is a transverse sectional elevation taken on the line 2 2, Fig. 1, further illustrating my improved structure.

In the above drawings, A is the shell of the boiler, having Within it in the present instance two corrugated cylinders a, forming furnaces, in each of which are grates a, supported in the well-known manner. Each of the said furnaces communicates at its rear end With a combustion-chamber B, which is formed of a plane tube-sheet t, a rear sheet a, curved to the form of a portion of a cylindrical surface and joining the top edge of the tube-sheet, and side sheets 6 united to the edges of the curved rear sheet 6 and to the side edges of the tube-sheet, said side sheets being so curved as to unite with the end of the furnace (0.

There is within the combustion-chamber a baflie-wall 6 extending upwardly at an angle from the bridge-wall a at the rear of the grate and supported by a plate and sections 6, which extend across said combustion-chamber. The curved rear section of said chamber is preferably supported from the rear sheet (6 of the boiler by means of a series of palm-stays a, there being, preferably at the point where said rear plate most nearly approaches the end of the boiler, a number of screw-stays (0 As shown by Fig. 2, the combustion-chambers are held together and to the cylindrical sides of the boiler by screw-stays a, there being, as in all boilers of the marine type, a series of tubes a from the tube-sheet b of the combustion-chamber to the front sheet a of the boiler. There are longitudinal stays at extending from the front to the rear end of the boiler.

With the ordinary form of marine boiler having a substantially rectangular combustion-chamber it is practically impossible to remove the scale from the rear face of this at the places where it extends adjacent to the rear sheet or end of the boiler, and while a portion of the scale may be removed near the top or bottom of the chamber it is practically impossible to provide a tool or, in fact, any other means by which the incrustation can be completely dislodged from the other portions of this rear surface.

By reference to the drawings of my invention it will at once be appreciated by those skilled in the art that it is a comparatively simple matter to inspect and have access to all parts of the scale-collecting surfaces of the combustion-chamber, not only on top, but also at the bottom thereof. It is further to be noted that by making the rear plate or plates of the combustion-chamber as a portion of a cylindrical surface a construction is provided which more than any other is fitted to suecessively resist the distorting effects of the extreme high pressures carried in modern boilers. It is further to be noted that while the products of combustion from the furnace of a boiler of the ordinary type strike upon the rear sheet of the combustion-chamber, which is practically at right angles to their direction of flow, my improved construction provides a curved surface which tends to gradually change the direction of flow of the heated gases, so that they are guided into tubes without the formation of eddies and with the least possible friction. It is also to be noted that my improved construction is one which promotes to the greatest possible extent the circulation of water in the boiler.

I claim as my invention 1. A boiler having a furnace, a series of tubes, and a combustion-chamber directly connected with and entered by both the furnace and the tubes, said combustion-chamber having a cylindrically-curved rear sheet, substantially as described.

2. A boiler having within it a combustionchamber, with a furnace and tubes both entering the same, the rear sheet or sheets of said combustion-chamber being continuously curved from the bottom rear edge of the furnace toward the rear of the boiler and being curved forwardly from a point adjacent to the rear of the boiler to the top of the chamber, substantially as described.

3. The combination with a boiler of a combustion-chamber having a furnace and tubes both entering it, said combustion-chamber including a front sheet for the reception of the furnace and tubes, side sheets of substantially semicircular form, and a cylindrically-curved rear sheet joined to the side sheets, substantially as described.

4. A boiler having a combustion-chamber, a furnace and tubes both entering said chamber, the rear sheet of ihe combustion-chamber being curved so as to form a portion of a cylindrical surface, with a series of palm-stays extending between said cylindrical surface and the rear end of the boiler, substantially as described.

5. A boiler having a combustion-chamber, tubes and a furnace both connected to the same, said combustion-chamber having side sheets of a substantially semicircular shape and an end sheet formed as a portion of a cylindrical surface, a grate in the furnace and a baffle-wall extending from the rear of the grate upwardly within the portion of greatest depth of the combustion-chamber, substantially as described.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

WVILLIAM JACK.

l/Vitnesses:

WILLIAM E. BRADLEY, Jos. H. KLEIN. 

